Waterquality - Pfannenberg Rack Serie Libro De Instrucciones

NOTE: If supply and return lines are overhead, the fluid in the piping may drain back and overflow the chiller reservoir if
the chiller is shut down. This can be prevented by using a check valve in the supply line, and either a solenoid valve on
the return line.
Corrosion protection:
PFANNENBERG recommends that Glycol is also used as a rust inhibitor. The minimum percentage of glycol (in a mixture with
water) recommended by some important glycol supplier (Clariant, Total, Dowfrost, etc..) is between 20% and 30%.
CAUTION:
Please contact the glycol supplier to know the minimum percentage needed in order to use
the glycol as rust inhibitor
CAUTION:
20%
The percentages of glycol into the mixture is related to the minimum working temperature of the mixture (that must be in line with
the minimum working set point of the unit, please see the technical data of the unit):
Propylene glycol
PP20P
PP30P
PP50P
Ethylene glycol
PP20E
PP30E
PP50E
CAUTION:
The higher the concentration of glycol the lower the amount of heat rejection you will be able
to get out of the fluid.
CAUTION:
The type of glycol (propylene or ethylene) must be in conformity with the Standard requested
by the application, please contact the Glycol supplier
.

8.1 Waterquality

All the typelabel of the STD Pfannenberg unit are provided with a percentage of glycol of
dilution
%
20
30
54
dilution
%
20
30
50
English
Working range temperature
Min [°C]
+10
0
-25
Working range temperature
Min [°C]
+10
0
-25
11
Freezing point
Max [°C]
+101
+103
+104
Freezing point
Max [°C]
+102
+103
+108
-8
-14
-38
-8
-15
-38